3 years ago

What is the value of the expression -5(3+4)?

Mathematics

2 answers:

givi [52]3 years ago

7 0

Answer:

top one is correct

the answer is -35

Step-by-step explanation:

BARSIC [14]3 years ago

4 0

-35 i think it is tha

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Aloiza [94]

G) X=4
H) X=2
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3 years ago

High grade steel consists of 85% iron and 15% magnese. Low grade steel consists of 67% iron and 33% mag ese. NASA orders 500 ton

Mamont248 [21]

Answer:

$361\dfrac{1}{9}$ tons of high steel and $138\dfrac{8}{9}$ tons of low steel

Step-by-step explanation:

Let x be the number of tons of high grade steel and y be the number of tons ow low grade steel needed.

In x tons of high grade steel there are

$0.85x$ tons of iron

$0.15x$ tons of magnese

In y tons of low grade steel there are

$0.67y$ tons of iron

$0.33y$ tons of magnese

NASA orders 500 tons of steel, so

$x+y=500$

and specifies that it must be in the proportion 80% iron and 20% magnese, so

$0.85x+0.67y=500\cdot 0.8\\ \\0.85x+0.67y=400$

From the first equation,

$x=500-y$

Substitute it into the second equation:

$0.85(500-y)+0.67y=400\\ \\425-0.85y+0.67y=400\\ \\-0.18y=-25\\ \\y=\dfrac{2,500}{18}=138\dfrac{8}{9}\ tons\\ \\x=361\dfrac{1}{9}\ tons$

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4 years ago

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-Dominant- [34]

Answer:

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Step-by-step explanation:

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3 years ago

I need to know the answer to this question

MAXImum [283]

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Nitella [24]

Answer:

( x − 1 ) ( x +3 )

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